( a preliminary plan of the soundstage.)
A few other items were holdovers from other sets. The gantries suspended from the ceiling are recycled from the Death Star Docking Bay set. In the scene where Han Solo is carrying off his reward for rescuing the princess, there's a background prop from Tatooine suspended from the ceiling. The rampant prop recycling that happened on the first Star Wars movie has become one of favorite features of the film. In a way it was a form of cutting corners, but the end product was put together such that you never notice, until you scrutinize every last detail. So in effect, their economy becomes an art from in itself.
Here's a video of a model Yavin Base I built to see what all the different shots of the Elstree Sound Stage all composited into one place. In the future, I'd like to build this model up to include the exterior of Yavin Base as well, from the matte painting of the exterior structure, to the shooting location in Tikal, Guatemala.